What is a Point Cloud Survey?

Laser scanning is an efficient and highly accurate method of capturing on-site data. At Draft23, we utilize the “Scan to BIM” process to convert point cloud data into detailed 3D parametric models, streamlining design workflows, improving decision-making, and monitoring project progress.

Laser scanning, also known as Light Detection and Ranging (LiDAR), is a technology that captures the shape and dimensions of physical objects without contact. Using a laser beam, it creates ‘point clouds’—dense collections of data points that form the foundation for precise 3D digital representations.

Initially developed for submarine detection, laser scanning is now widely applied in architecture and construction for both airborne and ground-based surveys.

1. Mechanism: A laser scanner emits pulsed light while rotating around a vertical axis, with a mirror oscillating the beam up and down. As the light reflects back, the scanner calculates each point’s position (X, Y, Z) based on the time taken for the light to return.
2. Data Capture: Scanners can collect millions of points per second. Multiple scans from various angles ensure complete site coverage, creating a highly detailed 3D representation.
3. Resolution: The density of collected points determines resolution. Additional data, like photographs or geo-coordinates, can be integrated for enhanced accuracy

Close Range: Ideal for small objects or intricate details (up to 0.5m range).

Mid-to-Long Range: Captures data from 20m to 2km with varying accuracies (a few mm to 100mm).

Airborne Scanners: Used for large-scale mapping from helicopters or drones, though accuracy decreases with distance.

Most modern scanners are portable, tripod-mountable, and operable by a single person.

Raw scan data is exported to a computer or storage device, then calibrated in specialized software. Once processed, the data integrates seamlessly into BIM tools like Autodesk Revit or Bentley MicroStation, enabling the creation and manipulation of precise 3D models.

1.Pre-Construction:

• Visualize sites in 3D before construction begins.
• Identify challenges and optimize designs, saving time and costs.
• Efficiently survey hazardous or inaccessible areas.

2.Construction:

• Monitor progress and verify designs using footprints, elevations, and models.
• Enhance quality control and streamline interior fit-outs.
• Create detailed 2D plans and as-built records.

3.Post-Construction:

• Deliver as-built models for facility management.
• Provide essential data for renovations or future projects.

Laser scanning’s applications extend beyond construction, including:

• Crime scene or accident analysis.
• Environmental modeling for forestry, flooding, and pollution.
• Urban planning and coastline management.

At Draft23, we work closely with surveyors to deliver 2D or 3D plans, and BIM models tailored to your project’s needs. Our expertise ensures accuracy and efficiency from concept to completion, leveraging cutting-edge scanning technology for optimal results.